Can you find wiring diagram? You’re headlights, meaning both of them? First would check ground and connectors for corrosion. Look for wires chafing. If they are good them you have to get multimeter and trace each wire from point a to point b. You can also back probe to check voltage. When doing this need to wiggle harness see if voltage fluctuation? Which might mean break stains in particular wire. That’s why it may be costly, time consuming to actually find fault?
Like others has said it both are blinking I would suspect grounding/corrosion problem?
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